In streaming mode it is preferable to fade to silence when sender stops sending, or long period of packet loss.

test=try bots.
Review URL: https://webrtc-codereview.appspot.com/1272004

git-svn-id: http://webrtc.googlecode.com/svn/trunk/webrtc@3771 4adac7df-926f-26a2-2b94-8c16560cd09d
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